Colour vision deficiency (colour blindness) – NHS

Colour vision deficiency (colour blindness)

People with colour vision deficiency find it difficult to identify and distinguish between certain colours.

It’s sometimes called being “colour blind”, although total colour blindness (an inability to see any colour) is very rare.

Colour vision deficiency is usually passed on to a child by their parents (inherited) and is present from birth, although sometimes it can develop later in life.

Most people are able to adapt to colour vision deficiency and it’s rarely a sign of anything serious.

Types and symptoms of colour vision deficiency

Most people with colour vision deficiency have difficulty distinguishing between shades of red, yellow and green.

This is known as “red-green” [...]

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